Now this is cool
"How to create a LEGO mosaic
When my oldest son was born in 2001 LEGO offered a cool online 'Brick-o-lizer' that would take an uploaded photo and turn it into a five-tone grayscale grid of 1×1 bricks from which you could create a wall-hanging mosaic. LEGO would send you the exact right amount of bricks in bulk. Putting it together was as easy as paint-by-numbers. I did this for him and for his little brother in 2003."